Apparatus and method of processing bitstream of embedded codec which is received in units of packets

• US 20070133619A1
• Filed: 12/08/2006
• Published: 06/14/2007
• Est. Priority Date: 12/08/2005
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lee, Mi, Kim, Do, Kim, Dae
• Granted Patent: US 7,773,633 B2
• Time in Patent Office: Days
• US Class Current: 370/516
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/2416 Real-time traffic
• CPC Class Codes: H04L 47/34 ensuring sequence integrity, e.g. using sequence numbers
• CPC Class Codes: H04L 47/43 Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/752 adapting media to network capabilities
• CPC Class Codes: H04L 65/756 adapting media to device capabilities
• CPC Class Codes: H04L 65/764 at the destination reformatting of additional data in video clients H04N21/4355
• CPC Class Codes: H04L 65/80 Responding to QoS

Abstract

Provided are a packet processing apparatus and method used when an output bitstream of an embedded codec is divided into a plurality of packets and transmitted accordingly, and more particularly, an efficient packet processing apparatus and method which can reduce deterioration of sound quality which may occur when a packet required for the reproduction of a voice signal is not received due to different arrival times of a plurality of packets at a receiving end if an output bitstream of an embedded codec is divided into the packets and transmitted accordingly through a path or a plurality of paths. In particular, an apparatus for processing packets of an embedded codec is provided. The apparatus includes a packet reception unit receiving packets, a layer information unit identifying layer information from received packets, a bitstream determination unit using the received packets, and a bitstream generation unit generating a new bitstream. The apparatus is used to provide a voice and multimedia service using an embedded codec in a packet network.

Claims

1. An apparatus for processing a bitstream of an embedded codec, which is received in units of packets, the apparatus comprising:

a packet reception unit receiving the bitstream of the embedded codec, which comprises a plurality of layers, in units of packets including the layers;

a layer information unit identifying layer information from received packets;

a bitstream determination unit assembling bitstreams of the received packets based on the identified layer information and forming the bitstream as it was initially transmitted;

a bitstream generation unit, if the packet reception unit has not received a packet including a layer, assembling received packets of layers, which are lower than the layer corresponding to the unreceived packet based on the identified layer information and generating a new bitstream; and

a decoder decoding the bitstream formed or generated by the bitstream determination unit or the bitstream generation unit.

2. The apparatus of claim 1, wherein which layer of the bitstream is to be included in each of the received packets is predetermined when the bitstream is initially transmitted.

3. The apparatus of claim 1, further comprising:

a jitter buffer storing the bitstream received in units of packets; and

a jitter buffer size adjustment unit adjusting the size of the jitter butter.

4. The apparatus of claim 3, wherein the packets, in units of which the bitstream is received, are stored in different jitter buffers, respectively.

5. The apparatus of claim 1, where, if the unreceived packet is a packet of a core layer, which is a minimum unit layer for decoding, the bitstream generation unit does not generate the new bitstream.

6. The apparatus of claim 1, wherein the layer information unit identifies the layer information by receiving the layer information of the packets according to paths through which the packets are received.

7. The apparatus of claim 1, wherein the layer information unit identifies the layer information included in a real-time transport protocol (RTP) header of each of the packets.

8. A method of processing a bitstream of an embedded codec, which is received in units of packets, the method comprising:

receiving the bitstream of the embedded codec, which comprises a plurality of layers, in units of packets including the layers;

identifying layer information from received packets;

assembling bitstreams of the received packets based on the identified layer information and forming the bitstream as it was initially transmitted;

if a packet including a layer has not been received, assembling received packets of layers, which are lower than the layer corresponding to the unreceived packet based on the identified layer information and generating a new bitstream; and

decoding the bitstream formed or generated in the assembling of the bitstreams of the received packets and the forming of the bitstream or in the assembling of the received packets of the layers and the generating of the new bitstream.

9. The method of claim 8, wherein which layer of the bitstream is to be included in each of the received packets is predetermined when the bitstream is initially transmitted.

10. The method of claim 8, wherein the bitstream received in units of packets in the receiving of the bitstream of the embedded codec is stored in a jitter buffer, and the size of the jitter buffer can be adjusted.

11. The method of claim 10, wherein the packets, in units of which the bitstream is received, are stored in different jitter buffers, respectively.

12. The method of claim 8, wherein, in the identifying of the layer information, if the unreceived packet is a packet of a core layer, which is a minimum unit layer for decoding, the new bitstream is not generated.

13. The method of claim 8, wherein, in the identifying of the layer information, the layer information is identified by receiving the layer information of the packets according to paths through which the packets are received.

14. The method of claim 8, wherein, in the identifying of the layer information, the layer information included in an RTP header of each of the packets is identified.

15. A computer-readable recording medium on which the method of claims 8 through 14 is recorded.